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In my code, I wrote some trace messages by using System.Diagnostics.Trace.WriteLine, but where could I get the messages? I have looked at Event Viewer but didn't find them.
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Diagnostics. Debug. WriteLine will display in the output window ( Ctrl + Alt + O ), you can also add a TraceListener to the Debug.
Tracing helps you isolate problems and fix them without disturbing a running system. This class provides methods to display an Assert dialog box, and to emit an assertion that will always Fail. This class provides write methods in the following variations: Write.
Diagnostics provides a set of attributes and classes to interact with the system process, event managers, performance counts, etc. This namespace can help us too in debugging jobs. Let's review the useful actions inside System. Diagnostics namespace.
You can enable debugging or tracing by adding a #define DEBUG or #define TRACE line to the top of your code or using the /d:DEBUG or /d:TRACE compiler switch when you compile. See the example in Listing 21.7.
Are you debugging? Look at the "Output" Tab (View | Output, or Ctrl+Alt+O) in Visual Studio.
If it's not outputting there, you need to add a listener.
Check this documentation.
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Virtually, the key feature of Trace is that the trace messages are independent from the IDE basically. Because trace messages are also available in the release build, you can also get them, when the software was already shipped and/or you have no IDE in avail. You guessed right, there is a tool, which makes you see those messages apart from VS. If you are not debugging (i.e. no debug-console allocated in VS), you can see the trace messages with the tool Debugview running in parallel instead of Windows' EventViewer. It is also possible to write trace messages to a file by editing/creating a *.config file accompanying the assembly in question, which also records the history of messages.
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